Abstract:
OBJECTIVE:To investigate the differences between skeletal and chronological age and to assess the role of maturity status, anthropometric data, and football related variables in explaining injury statistics in elite schoolboy footballers. DESIGN:Prospective study of injuries in schoolboy footballers according to skeletal age. SETTING:Premier league football club in England. PARTICIPANTS:292 schoolboy players (age 9-16) registered at the club INTERVENTIONS:Annual x ray film of hand or wrist. MAIN OUTCOME MEASURES:Data on injury 2001-7. Skeletal age determined with the Fels method. Skeletal age of more than one year above chronological age was classified as an early maturer, within one year as a normal maturer, and more than one year below normal as a late maturer. Injury and hours of training and rates of exposure to match play. RESULTS:Over six years 476 injuries were reported. The mean chronological age (11.74 (SD 2.35) years) and skeletal age defined by x ray picture (12.08 (SD 3.14) years) showed a significant mean difference of -0.344 (95% confidence interval -0.490 to -0.198; t=-4.64, df=280). Analysis of covariance showed that injury incidents did not differ significantly with maturity status after adjusting for training time, playing time, height, and position played (F=0.3(2,160), P=0.73). General log linear analysis with a Poisson model showed that difference in maturity, playing hours, and training hours collectively explained 48% of the variance in injury incidents. Injury exposure rates differed considerably, with 1.44/1000 hours for training and 10.5/1000 hours for match play. CONCLUSION:Maturity, defined by the difference between chronological age and skeletal age, plus training and playing hours together predict injury in schoolboy footballers. Injury exposure rates were higher for match play than training, which could have implications for targeting preventative interventions by academy staff. The use of skeletal age measurements to establish accurate "windows of opportunity" for training is more appropriate than the commonly used chronological age. Caution is needed when interpreting differences in injury occurrence as the factors that contribute are often complex.
journal_name
BMJjournal_title
BMJ (Clinical research ed.)authors
Johnson A,Doherty PJ,Freemont Adoi
10.1136/bmj.b490subject
Has Abstractpub_date
2009-02-26 00:00:00pages
b490eissn
0959-8138issn
1756-1833journal_volume
338pub_type
杂志文章abstract:OBJECTIVE:To assess evidence from randomised clinical trials about the effectiveness of extracts of Boswellia serrata (frankincense). DESIGN:Systematic review. DATA SOURCES:Electronic searches on Medline, Embase, Cinahl, Amed, and Cochrane Library. Hand searches of conference proceedings, bibliographies, and departme...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,评审
doi:10.1136/bmj.a2813
更新日期:2008-12-17 00:00:00
abstract::Telephone helplines are an effective way of dealing with health related incidents in which large numbers of people need personal counselling or information for reassurance or case finding. Helplines often have to be set up at short notice, which is labour intensive and makes recruitment of appropriate staff difficult....
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,评审
doi:10.1136/bmj.309.6946.44
更新日期:1994-07-02 00:00:00
abstract:OBJECTIVE:To establish the extent of prescribing injectable and oral methadone to opiate addicts and the practice characteristics and dispensing arrangements attached to these prescriptions. DESIGN:National survey of 25% random sample of community (high street) pharmacies through postal questionnaire, with four mailin...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.313.7052.270
更新日期:1996-08-03 00:00:00
abstract:OBJECTIVE:To determine the effects on independence in older people needing rehabilitation in a locality based community hospital compared with care on a ward for elderly people in a district general hospital. DESIGN:Randomised controlled trial. SETTING:Care in a community hospital and district general hospital in Bra...
journal_title:BMJ (Clinical research ed.)
pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
doi:10.1136/bmj.38498.387569.8F
更新日期:2005-08-06 00:00:00
abstract:OBJECTIVE:To assess relative efficacy and toxicity of aminoglycosides given by single daily dose compared with multiple daily doses. DESIGN:Meta-analysis of 21 randomised trials identified through MEDLARS (1966 to January 1995). Data were overviewed with fixed effects and random effects models and with meta-regression...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,meta分析
doi:10.1136/bmj.312.7027.338
更新日期:1996-02-10 00:00:00
abstract:OBJECTIVE:To determine whether the increased iron demands of pregnancy could be met by increased absorption from dietary sources. DESIGN AND SETTING:Longitudinal prospective study in the research unit of a maternity hospital. SUBJECTS:12 normal pregnant women. INTERVENTIONS:At 12, 24, and 36 weeks' gestation (within...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.309.6947.79
更新日期:1994-07-09 00:00:00
abstract:OBJECTIVE:To examine the absolute risks or benefits on cancer associated with oral contraception, using incident data. DESIGN:Inception cohort study. SETTING:Royal College of General Practitioners' oral contraception study. PARTICIPANTS:Directly standardised data from the Royal College of General Practitioners' oral...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,多中心研究
doi:10.1136/bmj.39289.649410.55
更新日期:2007-09-29 00:00:00
abstract:OBJECTIVE:To determine the outcome of administration of neuroleptics to patients with senile dementia of Lewy body type confirmed at necropsy. DESIGN:Retrospective analysis of clinical notes blind to neuropathological diagnosis. SETTING:Specialist psychogeriatric assessment units referring cases for necropsy to a tea...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.305.6855.673
更新日期:1992-09-19 00:00:00
abstract::The development of a molecular genetics diagnostic service over a three year period was studied in a National Health Service region with a population of three million. Starting from a time when few diagnostic applications were possible, the number of disorders and the overall demand had grown rapidly. Conditions for w...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.297.6652.843
更新日期:1988-10-01 00:00:00
abstract:OBJECTIVE:To investigate whether work related stress, measured and defined as job strain, is associated with the overall risk of cancer and the risk of colorectal, lung, breast, or prostate cancers. DESIGN:Meta-analysis of pooled prospective individual participant data from 12 European cohort studies including 116,056...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,meta分析
doi:10.1136/bmj.f165
更新日期:2013-02-07 00:00:00
abstract::A brief note on the status of the AIDS pandemic, from the Amsterdam VIIIth International Conference on AIDS, warns that the course of the epidemic is not being altered by prevention efforts. AIDS occurs in every country, usually spread by heterosexual contact, so that women are equally affected with men. WHO estimat...
journal_title:BMJ (Clinical research ed.)
pub_type: 新闻
doi:10.1136/bmj.305.6847.209
更新日期:1992-07-25 00:00:00
abstract:OBJECTIVES: To determine whether late mortality after sepsis is driven predominantly by pre-existing comorbid disease or is the result of sepsis itself. DEIGN: Observational cohort study. SETTING: US Health and Retirement Study. PARTICIPANTS: 960 patients aged ≥65 (1998-2010) with fee-for-service Medicare coverage w...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.i2375
更新日期:2016-05-17 00:00:00
abstract:OBJECTIVE:To determine whether poor reporting of methods in randomised controlled trials reflects on poor methods. DESIGN:Observational study. SETTING:Reports of randomised controlled trials conducted by the Radiation Therapy Oncology Group since its establishment in 1968. PARTICIPANTS:The Radiation Therapy Oncology...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.328.7430.22
更新日期:2004-01-03 00:00:00
abstract:OBJECTIVE:To evaluate the effectiveness of neuromuscular training in reducing the rate of acute knee injury in adolescent female football players. DESIGN:Stratified cluster randomised controlled trial with clubs as the unit of randomisation. SETTING:230 Swedish football clubs (121 in the intervention group, 109 in th...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,随机对照试验
doi:10.1136/bmj.e3042
更新日期:2012-05-03 00:00:00
abstract::Chronic insomnia is a common condition that affects people worldwide and has negative effects on patients' health and wellbeing. The treatment of insomnia can be complex and time consuming for patients and providers. Although behavioral interventions are the first line therapy, there are barriers to access for these t...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,评审
doi:10.1136/bmj.i2123
更新日期:2016-07-06 00:00:00
abstract:OBJECTIVE:To evaluate the relative efficacy of the World Health Organization 2005 campaign (WHO-5) and other interventions to promote hand hygiene among healthcare workers in hospital settings and to summarize associated information on use of resources. DESIGN:Systematic review and network meta-analysis. DATA SOURCES...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,meta分析,评审
doi:10.1136/bmj.h3728
更新日期:2015-07-28 00:00:00
abstract:OBJECTIVE:To investigate the risks of adverse pregnancy and birth outcomes for treated and untreated bipolar disorder during pregnancy. DESIGN:Population based cohort study using data from national health registers. SETTING:Sweden. PARTICIPANTS:332,137 women with a last menstrual period anytime after 1 July 2005 and...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.e7085
更新日期:2012-11-08 00:00:00
abstract:OBJECTIVE:To investigate the risk of glioma in adults in relation to mobile phone use. DESIGN:Population based case-control study with collection of personal interview data. SETTING:Five areas of the United Kingdom. PARTICIPANTS:966 people aged 18 to 69 years diagnosed with a glioma from 1 December 2000 to 29 Februa...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,多中心研究
doi:10.1136/bmj.38720.687975.55
更新日期:2006-04-15 00:00:00
abstract:OBJECTIVE:To determine the incidence of cervical cancer after several negative cervical smear tests at different ages. DESIGN:Prospective observational study of incidence of cervical cancer after the third consecutive negative result based on individual level data in a national registry of histopathology and cytopatho...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,多中心研究
doi:10.1136/bmj.b1354
更新日期:2009-04-24 00:00:00
abstract:OBJECTIVE:To estimate the risk of acute myocardial infarction (AMI) or stroke in adults with non-alcoholic fatty liver disease (NAFLD) or non-alcoholic steatohepatitis (NASH). DESIGN:Matched cohort study. SETTING:Population based, electronic primary healthcare databases before 31 December 2015 from four European coun...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.l5367
更新日期:2019-10-08 00:00:00
abstract:OBJECTIVES:To assess the associations between both uric acid levels and hyperuricaemia, with ischaemic heart disease and blood pressure, and to explore the potentially confounding role of body mass index. DESIGN:Mendelian randomisation analysis, using variation at specific genes (SLC2A9 (rs7442295) as an instrument fo...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.f4262
更新日期:2013-07-18 00:00:00
abstract:OBJECTIVES:To investigate the association between four sociodemographic measures (unemployment, overcrowding, low social class, and the proportion of migrants from areas of high prevalence of tuberculosis) and average level and rate of change of notification rates for tuberculosis. DESIGN:Ecological analysis of both t...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.310.6985.963
更新日期:1995-04-15 00:00:00
abstract:OBJECTIVE:To determine whether peer review medical audit in a primary care setting changes clinical behaviour in relation to the management of hypertension. DESIGN:Review of medical records in general practices to identify hypertensive patients followed up by assessment of the pre-educational and post-educational mana...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.314.7085.942
更新日期:1997-03-29 00:00:00
abstract:OBJECTIVE:To assess the ability of radiographers to identify abnormal radiographs of patients attending accident and emergency departments. DESIGN:Prospective study over six weeks. SETTING:Teaching hospital casualty x ray department. PATIENTS:3394 consecutive patients referred for radiography. INTERVENTIONS:Radiogr...
journal_title:BMJ (Clinical research ed.)
pub_type: 临床试验,杂志文章
doi:10.1136/bmj.302.6776.568
更新日期:1991-03-09 00:00:00
abstract:OBJECTIVE:To determine whether the more intensive screening and treatment for prostate cancer in the Seattle-Puget Sound area in 1987-90 led to lower mortality from prostate cancer than in Connecticut. DESIGN:Natural experiment comparing two fixed cohorts from 1987 to 1997. SETTING:Seattle-Puget Sound and Connecticut...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,多中心研究
doi:10.1136/bmj.325.7367.740
更新日期:2002-10-05 00:00:00
abstract:OBJECTIVE:To determine whether women with atrial fibrillation have a higher risk of stroke than men. DESIGN:Nationwide retrospective cohort study. SETTING:Patients with a diagnosis of atrial fibrillation in the Swedish hospital discharge register between 1 July 2005 and 31 December 2008. Information about drug treatm...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.e3522
更新日期:2012-05-30 00:00:00
abstract:OBJECTIVES:To support already established epidemiological links between inmates of Glenochil prison positive for HIV infection by using molecular techniques and thus provide evidence of the extent of acquisition during a recent outbreak of the disease resulting from needle sharing. To identify possible sources of the o...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.314.7092.1446
更新日期:1997-05-17 00:00:00
abstract:OBJECTIVES:To quantify the relative contribution of premorbid and episode specific factors in determining the long term persistence of disabling symptoms of low back pain. DESIGN:Prospective cohort study. SETTING:Two general practices in the south Manchester area. PARTICIPANTS:180 patients, who previously participat...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,多中心研究
doi:10.1136/bmj.318.7199.1662
更新日期:1999-06-19 00:00:00
abstract:AIM:To compare perinatal morbidity and mortality for babies delivered in water with rates for babies delivered conventionally (not in water). DESIGN:Surveillance study (of all consultant paediatricians) and postal survey (of all NHS maternity units). SETTING:British Isles (surveillance study); England and Wales (post...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.319.7208.483
更新日期:1999-08-21 00:00:00
abstract:OBJECTIVE:To examine the distribution of patterns of macronutrient density in relation to obesity. DESIGN:Cross sectional. SETTING:Denmark. SUBJECTS:323 men and women aged 35-65 years, selected randomly from a larger population sample of Danish adults. MAIN OUTCOME MEASURE:Bias in dietary reporting of energy and pr...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.311.7011.986
更新日期:1995-10-14 00:00:00